Electric-lamp socket



D. HJORTH.

ELECTRIC LAMP SOCKET.

APPLICATION FILED MAR, 21, 1919.

Patented Aug. 23,

Jazz/iii goflh/ WW SWltCll UNITED STATES PATENT OFFICE.

MACHINE &; MANUFACTURING- CORPORATION OF CONNECTICUT.

00., 0F BRIDGEPORT, CONNECTICUT, A

ELECTRIC-LAMP SOCKET,

Specification of Letters Patent.

Patented Aug. 23, 1921.

Application filed March 27, 1919. Serial No. 285,522.

To all whom it may concern:

Be it known that 1, DAVID HJORTH, a citizen of the United States, and resident of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Electric- Lamp Sockets, of which the following is a specification.

My invention relates to new and useful improvements in incandescent lamp sockets such as are employed for inclosing either electric pendant switches or pull socket switches, v

The purpose of the invention is to provide a two part socket including ashell and cap adapted to telescopically engage each other; to provide the same with simple means for detachably connecting one to the other, and further to provide interlocking means for permitting the shell to be united with the cap in any desired position, and in a way to prevent one from rotating with respect to the other, and finally to design the two parts of the socket so that each may be easily and inexpensively manufactured from a single piece of sheet metal. 7

On the accompanying drawings forming a part of this specification similar characters of referencewill be found to designate like or corresponding parts throughout the several figures and of which:

Figure 1 shows a perspective view of the two members of in improved form of lamp socket, as designed for use upon a pendant Fig. 2 shows a central vertical cross section of the cap member, shown in Fig. 1.

Fig, 3 is an inside plan view of the same Fig. 4 is a further central vertical cross section of the cap, taken at a right angle to that of Fig. 2, and

Fig. 5 shows a pers ective view of the shell member, for a pull socket switch, constructed in accordance with my invention.

As will be noted, the socket is designed to be made of two pieces of metal, the shell being stamped out and formed up from one piece and the cap likewise produced from a second sheet The construction further permits the complete formation of these two parts by automatic machinery ready for assembling and with littleor no hand work.

Referring in detail to the characters of tween the outer ends of -ina reference marked upon the drawings, A in dicates the shell member, and B the cap which is adapted to fit over the upper edge portion of the shell when assembling the two to form a complete inclosed socket. The shell may be of the'design shown in Fig. 1 adapted td inclose a pendant switch and having a central hole 6 in its lower end to accommodate a push button, or it may be shaped as seen in Fig. 5 to inclose a pull socket switch, not shown, and having a wider slot 7 formed in its larger upper portion, to Iaccommodate the usual operating chain or rey.

The lower contracted portion of this shell, as well as that shown in Fig. 1, may be of any preferred design to accommodate the particular style of switch mechanism and lamp to be used in connection therein.

The upper connecting end portion of this shell is cut to form an annular series of teeth 8 with pockets 9 therebetween. The ends of these teeth are slightly pointed and the pick ets are widest across their open ends, be-

the teeth, so as to assemblingof the formed in one side better permit that side to be pressed in for disengaging the shell from the cap. One of the teeth adjoining this slot 7 is provided with an outwardly disposed projection 10 that is preferably formed by stamping the metal outward from the body of the tooth and to project the same way to produce an inclined outer .top surface 11 and a shoulder 12 upon the under side. One or more similar lugs 13 are also formed in one'or more of the teeth directly opposite for the like purpose of engagement with the cap when positioned upon the shell.

The cap as shown is preferably formed of one the dome portion 14, the annular flange 15, an upper inner annular shoulder 16 and the lower inner annular shoulder 17. The upper shoulder as will be noted ably shapingtthe metal at the junction of the dome and flange as indicated, while the lower annular shoulder is produced by rolling in and down the annular raw edge of the stock. The upper shoulder engagement with the end of the teeth, to limit the movement of'the shell in the cap better facilitate the quick shell and cap. The slot 7 of the shell serves to piece of metal and shaped to include is formed by suit serves as a stop for the while the lower shoulder serves to be alitomatically engaged by the outwardly disposed projections on the teeth when the cap is positioned thereon.

I further provide an inwardly disposed lug 18 upon the inside of the flange of the shell and between the upper and lower annular shoulders for the purpose of entering one of the pockets between the teeth and thereby to form astop to prevent the shell from turning within the cap when positioned thereon. By reason of the particular construction of the engaging portions of the two members it is not material as to just how the cap and shell are brought together as the shape of the teeth will insure the lug entering therebetween and thereby allowing the cap to be shoved down upon the shell in a way to cause the projections on the teeth to snap over the lower inner annular shoulder and hold the parts together. In order to remove the cap it is simply necessary to press in on the side of the shell adjoining the slot in a manner to disengage the projection 10 which releases the shell from the caplin a way to allow these to be separated.

aving thus described my invention, what I claim and desire to secure by Letters Patent, is-

1. An incandescent lamp socket comprising a shell having a series of notches in the upper end thereof defining a series of resilient teeth, some of said teeth being provided with outwardly struck portions and a cap having an inwardly projecting ledge with the struck out portions of said teeth engaging the upper edge of said ledge for retaining the cap upon the shell.

2. An incandescent lamp socket comprising a shell having a series of notches in the upper end thereof defining a series of resilient teeth, some of said teeth being provided with outwardly struck portions and a cap having an inwardly projecting ledge with the struck out portions of said teeth engaging the upper edge of said ledge for retaining the cap upon the shell, said shell being constructed of resilient material whereby inward pressure on the shell at points adj acent said struck out portions will free the shell from the cap.

3. An incandescent lamp socket comprising a shell having a series of notches in the upper end thereof defining a series of resilient=teeth, some of said teeth being provided with outwardly struck portions, :1 cap having an inwardly projecting ledge with the struck out portions of said teeth engaging the upper edge of said'ledge for retaining the cap upon the shell, and a lug carried by the inner wall of said cap for reception in certain of said notches to prevent relative rotary movement between the cap and shell.

Signed at Bridgeport, in the county of Fairfield and State of Connecticut, this 25 day of March, A. D. 1919.

DAVID HJORTH.

\Vitnesses:

C. M NEWMAN, LILLIAN M. ALLING. 

